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# JapaneseChronology

`public final class JapaneseChronology`
`` `extends AbstractChronology` `implements Serializable`

java.lang.Object
↳ | java.time.chrono.AbstractChronology
| ↳ | java.time.chrono.JapaneseChronology

The Japanese Imperial calendar system.

This chronology defines the rules of the Japanese Imperial calendar system. This calendar system is primarily used in Japan. The Japanese Imperial calendar system is the same as the ISO calendar system apart from the era-based year numbering.

Japan introduced the Gregorian calendar starting with Meiji 6. Only Meiji and later eras are supported; dates before Meiji 6, January 1 are not supported.

The supported `ChronoField` instances are:

- `DAY_OF_WEEK`
- `DAY_OF_MONTH`
- `DAY_OF_YEAR`
- `EPOCH_DAY`
- `MONTH_OF_YEAR`
- `PROLEPTIC_MONTH`
- `YEAR_OF_ERA`
- `YEAR`
- `ERA`

## Summary

### Fields
`public static final JapaneseChronology` | `INSTANCE` Singleton instance for Japanese chronology.

### Public methods
`JapaneseDate` | `date(int prolepticYear, int month, int dayOfMonth)` Obtains a local date in Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields.
`JapaneseDate` | `date(Era era, int yearOfEra, int month, int dayOfMonth)` Obtains a local date in Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields.
`JapaneseDate` | `date(TemporalAccessor temporal)`
`JapaneseDate` | `dateEpochDay(long epochDay)` Obtains a local date in the Japanese calendar system from the epoch-day.
`JapaneseDate` | `dateNow(ZoneId zone)`
`JapaneseDate` | `dateNow()`
`JapaneseDate` | `dateNow(Clock clock)`
`JapaneseDate` | `dateYearDay(Era era, int yearOfEra, int dayOfYear)` Obtains a local date in Japanese calendar system from the era, year-of-era and day-of-year fields.
`JapaneseDate` | `dateYearDay(int prolepticYear, int dayOfYear)` Obtains a local date in Japanese calendar system from the proleptic-year and day-of-year fields.
`JapaneseEra` | `eraOf(int eraValue)` Returns the calendar system era object from the given numeric value.
`List<Era>` | `eras()`
`String` | `getCalendarType()` Gets the calendar type of the underlying calendar system - 'japanese'.
`String` | `getId()` Gets the ID of the chronology - 'Japanese'.
`boolean` | `isLeapYear(long prolepticYear)` Checks if the specified year is a leap year.
`ChronoLocalDateTime<JapaneseDate>` | `localDateTime(TemporalAccessor temporal)`
`int` | `prolepticYear(Era era, int yearOfEra)`
`ValueRange` | `range(ChronoField field)`
`JapaneseDate` | `resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle)` Resolves parsed `ChronoField` values into a date during parsing.
`ChronoZonedDateTime<JapaneseDate>` | `zonedDateTime(TemporalAccessor temporal)`
`ChronoZonedDateTime<JapaneseDate>` | `zonedDateTime(Instant instant, ZoneId zone)`

### Inherited methods
From class `java.time.chrono.AbstractChronology`
`int` | `compareTo(Chronology other)` Compares this chronology to another chronology.
`boolean` | `equals(Object obj)` Checks if this chronology is equal to another chronology.
`int` | `hashCode()` A hash code for this chronology.
`ChronoLocalDate` | `resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle)` Resolves parsed `ChronoField` values into a date during parsing.
`String` | `toString()` Outputs this chronology as a `String`, using the chronology ID.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.time.chrono.Chronology`
`abstract int` | `compareTo(Chronology other)` Compares this chronology to another chronology.
`default ChronoLocalDate` | `date(Era era, int yearOfEra, int month, int dayOfMonth)` Obtains a local date in this chronology from the era, year-of-era, month-of-year and day-of-month fields.
`abstract ChronoLocalDate` | `date(int prolepticYear, int month, int dayOfMonth)` Obtains a local date in this chronology from the proleptic-year, month-of-year and day-of-month fields.
`abstract ChronoLocalDate` | `date(TemporalAccessor temporal)` Obtains a local date in this chronology from another temporal object.
`abstract ChronoLocalDate` | `dateEpochDay(long epochDay)` Obtains a local date in this chronology from the epoch-day.
`default ChronoLocalDate` | `dateNow(Clock clock)` Obtains the current local date in this chronology from the specified clock.
`default ChronoLocalDate` | `dateNow(ZoneId zone)` Obtains the current local date in this chronology from the system clock in the specified time-zone.
`default ChronoLocalDate` | `dateNow()` Obtains the current local date in this chronology from the system clock in the default time-zone.
`default ChronoLocalDate` | `dateYearDay(Era era, int yearOfEra, int dayOfYear)` Obtains a local date in this chronology from the era, year-of-era and day-of-year fields.
`abstract ChronoLocalDate` | `dateYearDay(int prolepticYear, int dayOfYear)` Obtains a local date in this chronology from the proleptic-year and day-of-year fields.
`abstract boolean` | `equals(Object obj)` Checks if this chronology is equal to another chronology.
`abstract Era` | `eraOf(int eraValue)` Creates the chronology era object from the numeric value.
`abstract List<Era>` | `eras()` Gets the list of eras for the chronology.
`static Chronology` | `from(TemporalAccessor temporal)` Obtains an instance of `Chronology` from a temporal object.
`static Set<Chronology>` | `getAvailableChronologies()` Returns the available chronologies.
`abstract String` | `getCalendarType()` Gets the calendar type of the calendar system.
`default String` | `getDisplayName(TextStyle style, Locale locale)` Gets the textual representation of this chronology.
`abstract String` | `getId()` Gets the ID of the chronology.
`abstract int` | `hashCode()` A hash code for this chronology.
`abstract boolean` | `isLeapYear(long prolepticYear)` Checks if the specified year is a leap year.
`default ChronoLocalDateTime<? extends ChronoLocalDate>` | `localDateTime(TemporalAccessor temporal)` Obtains a local date-time in this chronology from another temporal object.
`static Chronology` | `of(String id)` Obtains an instance of `Chronology` from a chronology ID or calendar system type.
`static Chronology` | `ofLocale(Locale locale)` Obtains an instance of `Chronology` from a locale.
`default ChronoPeriod` | `period(int years, int months, int days)` Obtains a period for this chronology based on years, months and days.
`abstract int` | `prolepticYear(Era era, int yearOfEra)` Calculates the proleptic-year given the era and year-of-era.
`abstract ValueRange` | `range(ChronoField field)` Gets the range of valid values for the specified field.
`abstract ChronoLocalDate` | `resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle)` Resolves parsed `ChronoField` values into a date during parsing.
`abstract String` | `toString()` Outputs this chronology as a `String`.
`default ChronoZonedDateTime<? extends ChronoLocalDate>` | `zonedDateTime(Instant instant, ZoneId zone)` Obtains a `ChronoZonedDateTime` in this chronology from an `Instant`.
`default ChronoZonedDateTime<? extends ChronoLocalDate>` | `zonedDateTime(TemporalAccessor temporal)` Obtains a `ChronoZonedDateTime` in this chronology from another temporal object.
From interface `java.lang.Comparable`
`abstract int` | `compareTo(Chronology o)` Compares this object with the specified object for order.

## Fields

### INSTANCE

    public static final JapaneseChronology INSTANCE

Singleton instance for Japanese chronology.

## Public methods

### date

    public JapaneseDate date (int prolepticYear,
                    int month,
                    int dayOfMonth)

Obtains a local date in Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields.

The Japanese proleptic year, month and day-of-month are the same as those in the ISO calendar system. They are not reset when the era changes.

Parameters
`prolepticYear` | `int`: the proleptic-year
`month` | `int`: the month-of-year
`dayOfMonth` | `int`: the day-of-month

Returns
`JapaneseDate` | the Japanese local date, not null

Throws
`DateTimeException` | if unable to create the date

### date

    public JapaneseDate date (Era era,
                    int yearOfEra,
                    int month,
                    int dayOfMonth)

Obtains a local date in Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields.

The Japanese month and day-of-month are the same as those in the ISO calendar system. They are not reset when the era changes. For example:

      6th Jan Showa 64 = ISO 1989-01-06
      7th Jan Showa 64 = ISO 1989-01-07
      8th Jan Heisei 1 = ISO 1989-01-08
      9th Jan Heisei 1 = ISO 1989-01-09

Parameters
`era` | `Era`: the Japanese era, not null
`yearOfEra` | `int`: the year-of-era
`month` | `int`: the month-of-year
`dayOfMonth` | `int`: the day-of-month

Returns
`JapaneseDate` | the Japanese local date, not null

Throws
`DateTimeException` | if unable to create the date
`ClassCastException` | if the `era` is not a `JapaneseEra`

### date

    public JapaneseDate date (TemporalAccessor temporal)

Parameters
`temporal` | `TemporalAccessor`

Returns
`JapaneseDate` |

### dateEpochDay

    public JapaneseDate dateEpochDay (long epochDay)

Obtains a local date in the Japanese calendar system from the epoch-day.

Parameters
`epochDay` | `long`: the epoch day

Returns
`JapaneseDate` | the Japanese local date, not null

Throws
`DateTimeException` | if unable to create the date

### dateNow

    public JapaneseDate dateNow (ZoneId zone)

Parameters
`zone` | `ZoneId`

Returns
`JapaneseDate` |

### dateNow

    public JapaneseDate dateNow ()

Returns
`JapaneseDate` |

### dateNow

    public JapaneseDate dateNow (Clock clock)

Parameters
`clock` | `Clock`

Returns
`JapaneseDate` |

### dateYearDay

    public JapaneseDate dateYearDay (Era era,
                    int yearOfEra,
                    int dayOfYear)

Obtains a local date in Japanese calendar system from the era, year-of-era and day-of-year fields.

The day-of-year in this factory is expressed relative to the start of the year-of-era. This definition changes the normal meaning of day-of-year only in those years where the year-of-era is reset to one due to a change in the era. For example:

      6th Jan Showa 64 = day-of-year 6
      7th Jan Showa 64 = day-of-year 7
      8th Jan Heisei 1 = day-of-year 1
      9th Jan Heisei 1 = day-of-year 2

Parameters
`era` | `Era`: the Japanese era, not null
`yearOfEra` | `int`: the year-of-era
`dayOfYear` | `int`: the day-of-year

Returns
`JapaneseDate` | the Japanese local date, not null

Throws
`DateTimeException` | if unable to create the date
`ClassCastException` | if the `era` is not a `JapaneseEra`

### dateYearDay

    public JapaneseDate dateYearDay (int prolepticYear,
                    int dayOfYear)

Obtains a local date in Japanese calendar system from the proleptic-year and day-of-year fields.

The day-of-year in this factory is expressed relative to the start of the proleptic year. The Japanese proleptic year and day-of-year are the same as those in the ISO calendar system. They are not reset when the era changes.

Parameters
`prolepticYear` | `int`: the proleptic-year
`dayOfYear` | `int`: the day-of-year

Returns
`JapaneseDate` | the Japanese local date, not null

Throws
`DateTimeException` | if unable to create the date

### eraOf

    public JapaneseEra eraOf (int eraValue)

Returns the calendar system era object from the given numeric value. The numeric values supported by this method are the same as the numeric values supported by `JapaneseEra#of(int)`.

Parameters
`eraValue` | `int`: the era value

Returns
`JapaneseEra` | the Japanese `Era` for the given numeric era value

Throws
`DateTimeException` | if `eraValue` is invalid

### eras

    public List<Era> eras ()

Returns
`List<Era>` |

### getCalendarType

    public String getCalendarType ()

Gets the calendar type of the underlying calendar system - 'japanese'.

The calendar type is an identifier defined by the Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the `Chronology` using `Chronology#of(String)`. It can also be used as part of a locale, accessible via `Locale#getUnicodeLocaleType(String)` with the key 'ca'.

Returns
`String` | the calendar system type - 'japanese'

See also:

- `getId()`

### getId

    public String getId ()

Gets the ID of the chronology - 'Japanese'.

The ID uniquely identifies the `Chronology`. It can be used to lookup the `Chronology` using `Chronology#of(String)`.

Returns
`String` | the chronology ID - 'Japanese'

See also:

- `getCalendarType()`

### isLeapYear

    public boolean isLeapYear (long prolepticYear)

Checks if the specified year is a leap year.

Japanese calendar leap years occur exactly in line with ISO leap years. This method does not validate the year passed in, and only has a well-defined result for years in the supported range.

Parameters
`prolepticYear` | `long`: the proleptic-year to check, not validated for range

Returns
`boolean` | true if the year is a leap year

### localDateTime

    public ChronoLocalDateTime<JapaneseDate> localDateTime (TemporalAccessor temporal)

Parameters
`temporal` | `TemporalAccessor`

Returns
`ChronoLocalDateTime<JapaneseDate>` |

### prolepticYear

    public int prolepticYear (Era era,
                    int yearOfEra)

Parameters
`era` | `Era`
`yearOfEra` | `int`

Returns
`int` |

### range

    public ValueRange range (ChronoField field)

Parameters
`field` | `ChronoField`

Returns
`ValueRange` |

### resolveDate

    public JapaneseDate resolveDate (Map<TemporalField, Long> fieldValues,
                    ResolverStyle resolverStyle)

Resolves parsed `ChronoField` values into a date during parsing.

Most `TemporalField` implementations are resolved using the resolve method on the field. By contrast, the `ChronoField` class defines fields that only have meaning relative to the chronology. As such, `ChronoField` date fields are resolved here in the context of a specific chronology.

`ChronoField` instances are resolved by this method, which may be overridden in subclasses.

- `EPOCH_DAY` - If present, this is converted to a date and all other date fields are then cross-checked against the date.
- `PROLEPTIC_MONTH` - If present, then it is split into the `YEAR` and `MONTH_OF_YEAR`. If the mode is strict or smart then the field is validated.
- `YEAR_OF_ERA` and `ERA` - If both are present, then they are combined to form a `YEAR`. In lenient mode, the `YEAR_OF_ERA` range is not validated, in smart and strict mode it is. The `ERA` is validated for range in all three modes. If only the `YEAR_OF_ERA` is present, and the mode is smart or lenient, then the last available era is assumed. In strict mode, no era is assumed and the `YEAR_OF_ERA` is left untouched. If only the `ERA` is present, then it is left untouched.
- `YEAR`, `MONTH_OF_YEAR` and `DAY_OF_MONTH` - If all three are present, then they are combined to form a date. In all three modes, the `YEAR` is validated. If the mode is smart or strict, then the month and day are validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the first month in the requested year, then adding the difference in months, then the difference in days. If the mode is smart, and the day-of-month is greater than the maximum for the year-month, then the day-of-month is adjusted to the last day-of-month. If the mode is strict, then the three fields must form a valid date.
- `YEAR` and `DAY_OF_YEAR` - If both are present, then they are combined to form a date. In all three modes, the `YEAR` is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the requested year, then adding the difference in days. If the mode is smart or strict, then the two fields must form a valid date.
- `YEAR`, `MONTH_OF_YEAR`, `ALIGNED_WEEK_OF_MONTH` and `ALIGNED_DAY_OF_WEEK_IN_MONTH` - If all four are present, then they are combined to form a date. In all three modes, the `YEAR` is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the first month in the requested year, then adding the difference in months, then the difference in weeks, then in days. If the mode is smart or strict, then the all four fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year and month, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the month.
- `YEAR`, `MONTH_OF_YEAR`, `ALIGNED_WEEK_OF_MONTH` and `DAY_OF_WEEK` - If all four are present, then they are combined to form a date. The approach is the same as described above for years, months and weeks in `ALIGNED_DAY_OF_WEEK_IN_MONTH`. The day-of-week is adjusted as the next or same matching day-of-week once the years, months and weeks have been handled.
- `YEAR`, `ALIGNED_WEEK_OF_YEAR` and `ALIGNED_DAY_OF_WEEK_IN_YEAR` - If all three are present, then they are combined to form a date. In all three modes, the `YEAR` is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the requested year, then adding the difference in weeks, then in days. If the mode is smart or strict, then the all three fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the year.
- `YEAR`, `ALIGNED_WEEK_OF_YEAR` and `DAY_OF_WEEK` - If all three are present, then they are combined to form a date. The approach is the same as described above for years and weeks in `ALIGNED_DAY_OF_WEEK_IN_YEAR`. The day-of-week is adjusted as the next or same matching day-of-week once the years and weeks have been handled.

The default implementation is suitable for most calendar systems. If `ChronoField.YEAR_OF_ERA` is found without an `ChronoField.ERA` then the last era in `Chronology.eras()` is used. The implementation assumes a 7 day week, that the first day-of-month has the value 1, that first day-of-year has the value 1, and that the first of the month and year always exists.

Parameters
`fieldValues` | `Map`: the map of fields to values, which can be updated, not null
`resolverStyle` | `ResolverStyle`: the requested type of resolve, not null

Returns
`JapaneseDate` | the resolved date, null if insufficient information to create a date

### zonedDateTime

    public ChronoZonedDateTime<JapaneseDate> zonedDateTime (TemporalAccessor temporal)

Parameters
`temporal` | `TemporalAccessor`

Returns
`ChronoZonedDateTime<JapaneseDate>` |

### zonedDateTime

    public ChronoZonedDateTime<JapaneseDate> zonedDateTime (Instant instant,
                    ZoneId zone)

Parameters
`instant` | `Instant`
`zone` | `ZoneId`

Returns
`ChronoZonedDateTime<JapaneseDate>` |

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